City officials are urging residents to take precautions to guard against mosquito bites because West Nile virus and St. Louis encephalitis has been found in the local mosquito population.

No human cases of either virus have been reported in New Orleans.

Mosquitoes are most active between dusk and dawn and people who are outdoors for prolonged periods at night are urged to wear long sleeves and long pants.

The city is taking proactive measures including going door-to-door to treat and eliminate potential mosquito breeding sites including abandoned tires.  Workers also are applying insecticides by fog trucks and by airplane.

Residents are urged to remove standing water around their homes by turning over wading pools, buckets, trash cans, children's toys and anything else that can collect water.  Water should be changed at least weekly in containers that cannot be moved such as bird baths.